As always, time will tell just how good the deal is.
But if Kyrie is an MVP candidate a few times over the next 8 years, the Nets pick is #7 in a 5 player draft, Zizic tops out as a serviceable rebounder and nothing more, Crowder just had the best shooting year of his career last season, and IT leaves Cleveland in free agency this could all look very good.
And, really, no matter what else happens, if the Celtics win a championship with Kyrie as their best player and Cleveland never wins one with IT, Crowder, Zizic, or whoever the picks turn out to be, Danny will have won.